46 ON SOME NEW SOUTH WALES MINERALS. 
The rocks in which the Sunny Corner deposits occur are altered 
Devonian or Silurian shales and sandstones, penetrated by a 
pees dyke. The portion of the lode worked for silver, which 
early north and south with westerly dip, is mainly composed 
of a iow earthy ferruginous material, and is peers cavernous in 
places. The vuggs or cavities vary much in size, but are usually 
small, and are lined with ee ta of brown haute, externally 
of a deep brown or black colou 
The vein stuff is very Say rats coloured, yellow, brown, wigess 
red, black, &c., and contains but little mineral matter of a de fini 
Formerly this mine, when aga: by Messrs. Winter & Morgan, 
the first of whom used to bring me specimens from it for identifica- 
tion, was worked for gold sink and yielded some very rich returns. 
In some respects these concretions of pyrites resemble the cal- 
careous concretions of the London clay, known as septaria, and 
The Raasais ¢ occur in a pale-coloured shale of a greyish tint, 
abutting against the vein, full of cavities, which can be Ga to 
have formerly contained crystals of iron pyrite es. This gradually 
passes into a slaty shale of a dark bluish-grey hoon studded with 
cubical crystals of pyrites, most of which are twinned. 
s will be seen from the figure No. 2, the concretions of pyrites 
liste: a somewhat concentric ayia and are fissured in a more 
or less regular radiate mann 
Fie. 2. 
Concretion of Iron Pyrites, showing the radial lines. 
